Table 5.

Comparison of Tumor Points From INTERPHONE Grid Data With the Single-Voxel Tumor Origin Recorded by Neuroradiologists or the Calculated Gravity Center of the Tumor (n = 478), 2000–2004

Tumor Point	Distance From Preferred Eara to Recorded Origin Point or Gravity Center of Tumor, mm
	0–55			55.01–75			75.01–95			95.01–115			≥115.01b
	No.c	${\hat{\mathbf{\alpha }}}_1$ d	SE	No.	${\hat{\mathbf{\alpha }}}_2$	SE	No.	${\hat{\mathbf{\alpha }}}_3$	SE	No.	${\hat{\mathbf{\alpha }}}_4$	SE	No.	$\hat{\mathbf{\alpha }}$	SE
Origin pointe	25	1.82	0.32	100	1.82	0.28	127	1.48	0.22	105	1.09	0.18	121	1.00	N/A
Gravity center	24	1.75	0.58	105	1.68	0.24	126	1.52	0.22	95	1.00	0.13	128	1.00	N/A

Abbreviations: N/A, not applicable; SE, standard error.

^a Side of the head preferred for mobile phone use.

^b Reference category ($\widehat{\text{α}}$ = 1).

^c Number of tumors within a given interval.

^d The $\widehat{\text{α}}$ values represent the elevation in risk of observing a tumor within a given interval compared with the assumed baseline risk.

^e Result from Grell et al. (31).